Fish Game – Page _____

1.  What would be the phenotypes for each genotype below?

Genotype / Phenotype
GG
GR
GY
YY
RR
RY

Alleles: G = ______

R = ______

Y = ______

G is dominant to R

G is dominant to Y

R and Y are incompletely dominant

2.  Can two red fish mate and have green offspring? Why or why not?

______, because ______

______

3.  Can two orange fish mate and have yellow offspring? Why or why not?

______, because ______

______

4.  Can two green fish mate and have orange offspring? Why or why not?

______, because ______

______

5.  Which colors of fish will have good camouflage in this environment? ______

6.  Which will not have good camouflage in this environment? ______

7.  Make a first generation fish: Pull out two alleles in pairs without looking and place them in each fish. Repeat until the gene pool is empty. Record your results below.

Generation 1 / Generation 2 / Generation 3
Green
Red
Orange
Yellow
Total

8.  Have all the yellow genes disappeared from your gene pool? Why or why not?

______, because ______

______

9.  How does the third generation compare to the earlier generations in terms of colors of fish?

______, because ______

______

10.  Does natural selection act on an organism’s genotype or phenotype? Explain.

Natural selection acts on an organism’s ______, because ______

______